import {z} from 'zod'

export type GetApiApikeyWeatherLatLonArgs = {apikey: string, lat: number, lon: number, 'X-Delimiter'?: string | undefined, 'X-Separator'?: string | undefined};

export type GetApiApikeyWeatherLatLonOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const datasetWeather = z.object({datetime: z.string().optional(), timestamp: z.number().optional(), sky: z.number().gte(0).lte(1).optional(), temperature: z.number().optional(), condition: z.string().optional(), icon: z.string().optional(), wind_speed: z.number().optional(), wind_degrees: z.number().gte(0).lte(360).optional(), wind_direction: z.number().optional()});

export const messageOk = z.object({code: z.number().int().optional(), type: z.string().optional(), text: z.string().optional()});

export const responseWeather = z.object({result: z.array(datasetWeather).optional(), message: messageOk.optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Get weather forecast for a location
 * 
 * GET /{apikey}/weather/{lat}/{lon}
 */
export const getApiApikeyWeatherLatLon = async (args: GetApiApikeyWeatherLatLonArgs, options: GetApiApikeyWeatherLatLonOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args['X-Delimiter'] != null) headers.set("X-Delimiter", String(args['X-Delimiter']))
if (args['X-Separator'] != null) headers.set("X-Separator", String(args['X-Separator']))

const url = `${baseUrl.replace(/\/+$/, '')}/${encodeURIComponent(String(args.apikey))}/weather/${encodeURIComponent(String(args.lat))}/${encodeURIComponent(String(args.lon))}${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(responseWeather, await res.json())
};